Bug fix [JORAM-376]: Allows to configure SO_LINGER on JNDI socket.

joram/jndi/shared/src/main/java/fr/dyade/aaa/jndi2/msg/IOControl.java

 /*
  * JORAM: Java(TM) Open Reliable Asynchronous Messaging
- * Copyright (C) 2001 - 2019 ScalAgent Distributed Technologies
+ * Copyright (C) 2001 - 2021 ScalAgent Distributed Technologies
  * Copyright (C) 1996 - 2000 Dyade
  *
  * This library is free software; you can redistribute it and/or
@@ -51,7 +51,7 @@ public class IOControl {
   public static final int DEFAULT_SO_TIMEOUT = 5000;
 
   /**
-   *  Enable/disable SO_TIMEOUT with the specified timeout in milliseconds.
+   * Enable/disable SO_TIMEOUT with the specified timeout in milliseconds.
    * The default value is zero which means the option is disabled.
    *  This value can be adjusted by setting the environment property
    * <code>fr.dyade.aaa.jndi2.socketTimeOut</code>.
@@ -59,8 +59,15 @@ public class IOControl {
    * InputStream associated with this Socket will block for only this amount
    * of time.
    */
-  private static int socketTimeOut =
-      Configuration.getInteger(SO_TIMEOUT_PROP, DEFAULT_SO_TIMEOUT).intValue();
+  private static int socketTimeOut = Configuration.getInteger(SO_TIMEOUT_PROP, DEFAULT_SO_TIMEOUT).intValue();
+
+  public static final String SO_LINGER_PROP = "fr.dyade.aaa.jndi2.socketLinger";
+  
+  /**
+   * Enable SO_LINGER with the specified linger time in seconds, if the
+   * value is less than 0 then it disables SO_LINGER. Default value is -1.
+   */
+  private static int socketLinger = Configuration.getInteger(SO_LINGER_PROP, -1).intValue();
 
   private Socket socket;
 
@@ -72,7 +79,8 @@ public class IOControl {
     this.socket = socket;
     socket.setTcpNoDelay(true);
     socket.setSoTimeout(socketTimeOut);
-    socket.setSoLinger(true, 1000);
+    if (socketLinger > 0)
+      socket.setSoLinger(true, socketLinger);
     nos = new NetOutputStream(socket);
     bis = new BufferedInputStream(socket.getInputStream());
   }